◆Ministry of Education, Culture, Sports, Science and Technology
(MEXT:文部科学省)
http://www.mext.go.jp/english/  (English)

◆Japanese Language Proficiency Test (JEES)
http://www.jees.or.jp/jlpt/  (Japanese)

◆BJT Business Japanese Proficiency Test
http://www.kanken.or.jp/bjt/english/  (English)

◆Bonjinsha (凡人社)
http://www.bonjinsha.com/  (Japanese)

◆Sogakusha(創学社)
http://www.sogakusha.co.jp/  (Japanese)